Sound of the Sky OVA

In a lonely corner of the world, on the edge of No Man’s Land, sits Clocktower Fortress. It’s home to the 1121st Platoon of the Helvetian Army, and their newest member is a 15-year-old volunteer named Kanata Sorami, who enlisted to learn how to play the bugle. When she was a child, Kanata was saved by a beautiful soldier and found inspiration in the clear, golden sound of her trumpet. From that day forward, Kanata decided music would be her life. As the other platoon members train her how to be a bugler and a soldier, Kanata's enduring optimism will inspire them to look for happiness and beauty, even in a world haunted by war.

The first OVA titled Sore wa, ikinari otozureta=koi was released on March 29, 2019. The second OVA titled Tomodachi no Kyori was released on February 26, 2021. The third OVA titled Shain Ryokou to Negaigoto was released on October 14, 2021. Note: Unaired episodes bundled with the special edition of the 7th, 10th and 11th manga volumes.

Unaired episode included with the Blu-ray release, featuring a short snipped of each girl's arc with their clothes replaced with a swimsuit.

The Earth lies darkened and deserted. Despite the best efforts of the film's heroine, Hikaru, the evil-filled castle of Cephiro has taken over the world and stands in the center of a lifeless Tokyo. Before the ice-witch Alcyone can take her revenge on Hikaru, she is rescued by Lantis, a young man who seals her into a magical maze where she is challenged to prove her powers while her friends are hunted down by Cephiro's warlocks. Fleeing through the silent city, Umi and Fuu must seek out the sleeping Mashin; godlike creatures that will fuse with them to form giant warriors of awesome destructive power. But the Magic Knights are afraid, untrained and alone... will even the Mashin be enough to save them from the evil acts of Cephiro? Note: During 1998 Toshihiro Hirano released a Director's cut called "Special Edition - The Wings of Hope", including the three episodes in a two-hour movie with some new scenes and dialogue changes